When it comes to CW transmitters, this one takes the cake I think:
http://fhs-consulting.com/aa1tj/newenglandcodetalker.html
73, Dimitris
2012/12/20 Graham <[email protected]>:
> Now there is a idea , could use a music synth to make a wobbly
> note , and send it via the ssb exciter , for a real retro vintage cw
> sound ?
>
> just had a long retro data qso with Chris xiz , on 502 , must be 2
> years at least since used rtty , beacon still running now , not
> sure if anyone is still monitoring , all this web linking has
> spoiled things !
>
> 73 -G..
>
> From: M0FMT
> Sent: Wednesday, December 19, 2012 6:53 PM
> To: [email protected]
> Subject: Re: LF: Better picture of the 807 based 500kHz TX
>
> OK Graham
>
> Good point! But it doesn't jump it chirps quite pleasently Louis PA0LCE runs
> one on 500kc/s and tells me ops like the Retro sound.
>
> 73 es GL Pete M0FMT IO91UX
>
> From: Graham <[email protected]>
> To: [email protected]
> Sent: Wednesday, 19 December 2012, 17:52
> Subject: Re: LF: Better picture of the 807 based 500kHz TX
>
> Probably a early form of Spread Spectrum , hard to JAM if is its
> jumping about the band and difficult to make a fake transmission if
> the Tx has a wobbly bob signature : )
>
> G..
>
> From: M0FMT
> Sent: Wednesday, December 19, 2012 5:42 PM
> To: [email protected]
> Subject: Re: LF: Better picture of the 807 based 500kHz TX
>
> OK Mal
>
> Point taken. I was referring to a "Power" oscillator like a single 6L6 used
> as an Xtal oscillator running at 15 / 20Watts which means normally there is
> insufficient current (really) from a VR tube for the Anode(plate) so all
> that is necessary is to stab the screen. Otherwise I totally agree.
> I do know the standard T1154 chirps well. There is a PA0 who runs one on 500
> and I am sure you have worked him it is like a signature signal HI.
> I think there was some kind unpleasantness going on at the time of the T1154
> manufacture so the fine points of frequency control was probably a low
> priority.
> 73 es GL Pete M0FMT IO91UX
>
> From: mal hamilton <[email protected]>
> To: [email protected]
> Sent: Wednesday, 19 December 2012, 11:55
> Subject: Re: LF: Better picture of the 807 based 500kHz TX
>
> Hi Pete
> Stabilise both Plate es Screen on an Oscillator, followed by a Cathode
> follower to avoid chirp and osc pulling.
> The T1154 was very unstable with a bad chirp, surprised it ever passed
> Quality Control
> G3KEV
>
>
> ----- Original Message -----
> From: M0FMT
> To: [email protected]
> Sent: Wednesday, December 19, 2012 10:08 AM
> Subject: Fw: LF: Better picture of the 807 based 500kHz TX
>
> Try again minus cct too big I think.
>
> 73 es GL Pete M0FMT IO91UX
>
> ----- Forwarded Message -----
> From: M0FMT <[email protected]>
> To: "[email protected]" <[email protected]>
> Sent: Wednesday, 19 December 2012, 9:52
> Subject: Re: LF: Better picture of the 807 based 500kHz TX
>
> Hi Dimitris and group
>
> I have not seen the schematic but it is usual to stabilise the screen of a
> power oscillator to reduce chirp on key down.
> Now you have shown us yours I will show you mine. I usually sketch the
> schamatic after the event so foregive the presentation on the back of an
> envelope.
> I now get at least 4Watts after adjusting the ant link coupling away from
> the chasis. Best audible DX Kent 80miles best Opera DX PA0 land.
> 73 es GL Pete M0FMT IO91UX
>
> From: Dimitrios Tsifakis <[email protected]>
> To: [email protected]
> Sent: Tuesday, 18 December 2012, 23:46
> Subject: Re: LF: Better picture of the 807 based 500kHz TX
>
> 2012/12/19 Graham <[email protected]>:
>> Why the stabilised screen supply ?
>> G..
>
> It's embarassing. I like the glow of VR tubes! :-)
>
> 73, Dimitris VK1SV
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